Electric lamp.



W. J. LUSTED.

ELECTRIC LAMP.

APPLICATION FILED Ammo, 1911.

Patented Jul 2, 1912.

wrnnrrm J. Lns'rnn; or nos ANGELES, cenrronnm;

ELECTRIC LAMP.

Specification of Letters Patent.

' Patented July 2, 1912.

Application filed April 10, 1911. Serial'No. 820,159.

To all whom wit my concern:

Be it known that I, WILLIAM J. Lnsrnn, formerly a subject of the King of the: United Kingdom of Great Britain and Ireland, who has declared his intention of becoming a citizen of the United States and who has made his petition for naturalization as a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Electric Lamp, of which the following is a specification.

This invention relates to incandescent electric lamps, and the main object of the invention is to provide means whereby light from the filaments will be efiiciently distributed or transmitted to the room or other space to be lighted.

A further object of the invention is to provide an incandescent electric lamp with reflector means for intercepting and reflecting downwardly and outwardly into the 'room the light which would otherwise pass from the filaments into the neck of the lamp and be largely dissipated and lost.

Other objects of the invention will appear hereinafter.

The accompanying drawings illustrate the invention, and referring thereto :Figure 1 is a perspective of the preferred form of the invention. Fig. 2 is a horizontal section on line w -m Fig. 1. Fig. 3 is a side elevation showing a difierent form of invention. Fig. 4 is a vertical section of a portion of the lamp bulb and filament supporting means, showing a modified form of the invention.

- Figs. 5 and 6 are vertical sections of portions of the filament supporting means provided with modified forms of the lnvention.

1 designates the bulb of an incandescent electric lamp having a neck portion 1' provided with means indicated at 2 for engagement with socket or supporting means 3. The filaments 4 are mounted within the bulb on a ste 5 which is formed of glass sealed to the Fulb in the usual manner and may be prov ded with an extension 6 for supporting the lower ends of the filaments. This stem extension is also formed with a lateral flange or plate forming a reflector 'body or plate 9, this-plate also serving as the means for supporting the upper or inner ends of the filaments. Said filaments may be strung between said flange or plate 9-and a head 10 at the lower end of the stem extension, and additional filaments 8 may also be strung directly below said flange or plate" 9, the filaments being in each case connected to the supporting means by attaching devices such as hooks 12.

The flange or plate 9- constitntes a reflector, as well as means for attachment and support of the filaments, consisting, for example, of a disk or rounded plate of enameled glass, or porcelain, or other refractory reflecting material, or having such material on its lower face, said plate being fused to or formed on th glass stem so as to be integral therewith. In the form of the invention sho n in Figs. 1 andv 2, the said reflector pllte 9 is located at the inner portion of the ste above the filaments so that it will 'reflectd wnwardly the light passing from the filaments and will intercept the light which would otherwise pass to the upper or neck portion of the bulb and send such light out into the room instead of allowing it to be dissipated in the neck portion of the bulb. I

In the form of the invention shown in- Fig. 3, the. reflector plate indicated at 19 is at the outer end of the stem extension 6', this form being particularly suitable to a standing lamp, the light-in this case being reflected downwardly from said reflector plate 19, and the filaments being strung between this plate 19 and a collar 22 on stem extension 6. .In this case also supplementary filament portions indicated at 18 may be strung beneath this'reflector plate 19. To produce special effects in reflection, the reflector plate may be shaped inany desired manner. For example,'as shown at 20 in -Fig. 4, it may be convex, that is to. say, so as to present a convex surface toward the light coming from the filaments or as shown at 21 in Fig. 6 it may be concavely curved with respect to such light, or as shown in Fig. 5 the reflector plate, indicated at 24,-

"(3f the bulb or in the upper part .of the room.

That I claim is '1. In an incandescent electric lamp, a stem having an extension, 21 plate at one end of said extension, said plate having a reflector surface on the side toward the stem extension, and filaments secured at one end tending at right angles to said stem extension, at one end of said extension, and filaments secured at one end to the peripheral port-ion of said plate'and at the other end to the stemextension.

f y In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 20 4th day of April 1911.

- WILLIAM J. LUSTED.

In presence of ARTHUR P. KNIGHT,

FRANK L. A.'GRAHAM. 

